| 大跨度桥梁随机风场的模拟 |
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| 引用本文： | 曹映泓,项海帆,周颖.大跨度桥梁随机风场的模拟[J].土木工程学报,1998(3). |
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| 作者姓名： | 曹映泓 项海帆 周颖 |
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| 作者单位： | 同济大学
(曹映泓，项海帆)，西南交通大学(周颖) |
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| 摘 要： | 本文针对用于大跨度桥梁抖振时域分析的随机风场和Davenport相干函数的特点,对模拟多变量平稳随机过程的谐波合成法进行了改进.文中直接导出了互谱密度矩阵S(ω)的Cholesky分解的显式表达式;在不失精度的前提下,适当减少了部分余弦项;同时在模拟中运用了FFT技术,从而简化了计算过程,提高了计算速度.文章最后利用改进后的方法模拟了跨度为1000m的一座悬索桥的主梁随机风场,验证了方法的有效性.
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| 关 键 词： | 风场 随机过程 模拟 相干函数 |
SIMULATION OF STOCHASTIC WIND FIELD ON LONG-SPAN BRIDGE |
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| Cao Yinghong Xiang Haifan Zhou Ying.SIMULATION OF STOCHASTIC WIND FIELD ON LONG-SPAN BRIDGE[J].China Civil Engineering Journal,1998(3). |
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| Authors: | Cao Yinghong Xiang Haifan Zhou Ying |
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| Affiliation: | Cao Yinghong Xiang Haifan Zhou Ying(Tongji University) (Southwest Jiaotong University) |
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| Abstract: | In consideration of the characters of the stochastic wind field on long-span bridges and the Davenport's coherence function, an extended spectral representation method was proposed in this paper for simulating the stochastic wind field on long-span bridges. In this paper, an explicit expression of Cholesy's decomposition of the cross-spectral density matrixwas derived; some cosine functions were reasonably cut without sacrificing the accuracies; and the FFT technique was imposed into the algorithm. So the simulation can be easy and efficiently performed. According to this method, a stochastic wind field on the main beam of a suspended bridge with a span of 1000m was simulated so that the efficiency of the method was verified. |
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| Keywords: | wind field stochastic process simulation coherence function |
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